Filetype
The paper describes the development of a dynamic model of amicroturbine system. The paper was done in close cooperation with the gas turbine manufacturer Turbec AB and the model was tuned and verified against theirmicroturbine system T100. The microturbine unit consists of a compressor and a turbine connected on a single shaft to a high-speed generator.The model includes all the main thermodynamic
Popular Abstract in Swedish I Sverige och Norden har elproduktion traditionellt skett med huvudsakligen vattenkraft och kärnkraft. Detta håller dock på att förändras i takt med en allt större vindkraftsutbyggnad. Vindkraften skiljer sig i vissa avseenden från de traditionella produktionsslagen, ett av dessa är hur anslutningen till elnätet är utformad. Detta innebär att vindkraften, sedd från näteTraditionally the predominant generation has been large synchronous generators providing the system inertia. Nowadays when wind power and other non-synchronously connected units displaces this synchronous generation, the system inertia is reduced. Hence higher rate of change of frequency and larger frequency deviations are expected. This thesis deals with the impact on rate of change of frequency
Over the past few years, we have witnessed a growing popularity of new wireless architectures such as 3G, Wi-Fi and Wi-Max due to the increase in demand for wireless Internet access. The all-IP based future mobile and wireless network model is expected to be the most dominant architecture for QoS provisioning in next-generation wireless networks, mainly due to its scalability and capability of int
[abstract missing]
In the debate on how to make democracy strong against terrorism, it has been suggested that the Western democracies need new protective measures. This paper argues that, far from protecting democracy, such measures may in fact undermine the very values and virtues that make democracy possible. Information freedom, the right to due process and the protection of privacy are all fundamental for the
Coping with complexity. Sociocybernetics as a Framework for Communication Management.
As Rubenson has argued, "the main problem with life long learning is that it fails to critically assess how conditions for individual development, ethnic and social background, previous schooling and working life conditions create very different preconditions for life long learning" (Rubenson, 1996, p. 43). Using longitudinal data from the Malmö Longitudinal Study, the paper clarifies how differen
Popular Abstract in Swedish Syftet med avhandlingen var att öka förståelsen för socialt stöd för fysisk aktivitet bland ungdomar, då det råder motstridiga uppgifter när det gäller betydelsen av socialt stöd. Tre empiriska studier ingår i avhandlingen och samtliga problematiserar kring betydelsen av det sociala stödet för fysisk aktivitet bland ungdomar under gymnasietiden. Studie I är en kvantitThe aim of the present thesis was to enhance our understanding of social support for physical activity among adolescents. Earlier findings show inconsistent results with regard to the importance of social support. The present thesis includes three empirical studies examining adolescents (16-18 years) during their years in high-school. Study I was a cross-sectional quantitative study that concluded
